120 The Hartz. 



The combustible employed in this operation is coke ; a like mixture 

 produces from fourteen to fifteen quintals of lead, containing silver, 

 and from ten to twelve quintals of mattes. 



2. The matte produced by the last operation is roasted three times ; 

 each roasting lasts from eight to ten days, after which, it is smelted 

 with the same mixture, and in the same furnace as the preceding, 

 producing from ten to twelve quintals of lead (containing silver), and 

 from seven to eight quintals of mattes. 



3. Matte roasted three times and passed in the same furnace. 



4. Matte, after roasting, is smelted with a different mixture compos- 

 ed of 



32 centnars of roasted mattes. 

 20 quints, of scoria. 

 1 quint, of granulated iron. 



The products of a like operation for twenty four hours are thirty 

 four quints, of lead, — thirty quintals of a fifth matte, which now takes 

 the name of copper matte (Kupferstein), — which is treated precisely 

 as the last, giving a certain quantity of lead, and from forty five to 

 fifty quintals of a sixth matte, containing all the copper of the ore, 

 which is sent to Altenau to be purified. Here finishes the series of 

 operations practised at Franckenscharner Hutte. 



Production of Franckenscharner Hutte, in 1827. — 21,942 marks, 

 5 loths of silver not refined, and 20,264 marks, 2 loths refined; 14,655 

 quintals of litharge for commerce ; 294,880 quintals of litharge to 

 be reduced ; 26,968 quintals of lead. 



Production and consumption in 1828. — 2,560j roests of schlich 

 were smelted, (which contained after the assays 19,348 marks, 1^ 

 loths of silver, and 48,013 quintals of lead) besides 54,257 quintals 

 of mattes, which gave 25,687 quintals of lead to be cupelled, 

 52,731 quintals of lead mattes, and 904 quintals of copper mattes. 

 The lead by cupellation yielded 21,343 marks of silver not refined 

 or 19,740 of refined silver; litharge for commerce 14,900 quintals, 

 litharge to be reduced 45,230 quintals. 



Consumption. — 64,922 maas of charcoal 25,322 balgen of coke. 

 2,213 maas of Pine buds, 5,948| schlorhs of fagots, 2,561 matters 

 of fir wood consumed in roasting the mattes. 12,990 quintals of iron 

 3,607 postes of 12 hours each ; 9,990 postes of 24 hours each. 

 Total expense of the works 103,619 Prussian dollars 9 silver gro- 

 schens 3| fenings. 



